On Thu, Jul 16, 2020 at 05:16:19PM -0700, Bjorn Andersson wrote: > With many Qualcomm platforms not having functional S2CR BYPASS a > temporary IOMMU domain, without translation, needs to be allocated in > order to allow these memory transactions. > > Unfortunately the boot loader uses the first few context banks, so > rather than overwriting a active bank the last context bank is used and > streams are diverted here during initialization. > > This also performs the readback of SMR registers for the Qualcomm > platform, to trigger the mechanism. > > This is based on prior work by Thierry Reding and Laurentiu Tudor. > > Tested-by: John Stultz <john.stultz@xxxxxxxxxx> > Tested-by: Vinod Koul <vkoul@xxxxxxxxxx> > Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > --- > > Changes since v1: > - Rebased to avoid conflict > - Picked up tested-by > > drivers/iommu/arm-smmu-qcom.c | 11 +++++ > drivers/iommu/arm-smmu.c | 79 +++++++++++++++++++++++++++++++++-- Perhaps the CB allocator callback can help to reduce the changes to the core driver here. What do you think? Will
